Remove usage of FOR_EACH_OBSERVER macro in components/sync

components/sync/engine_impl/cycle/sync_cycle.cc

Index: components/sync/engine_impl/cycle/sync_cycle.cc
diff --git a/components/sync/engine_impl/cycle/sync_cycle.cc b/components/sync/engine_impl/cycle/sync_cycle.cc
index d56f9dba50333a33c107007e4da00a5c29bcc616..a65d69c2f0eb0e1186c51f19103f034c4f62b42b 100644
--- a/components/sync/engine_impl/cycle/sync_cycle.cc
+++ b/components/sync/engine_impl/cycle/sync_cycle.cc
@@ -65,8 +65,8 @@ void SyncCycle::SendSyncCycleEndEventNotification(
 
   DVLOG(1) << "Sending cycle end event with snapshot: "
            << event.snapshot.ToString();
-  FOR_EACH_OBSERVER(SyncEngineEventListener, *(context_->listeners()),
-                    OnSyncCycleEvent(event));
+  for (auto& observer : *context_->listeners())
+    observer.OnSyncCycleEvent(event);
 }
 
 void SyncCycle::SendEventNotification(SyncCycleEvent::EventCause cause) {
@@ -74,13 +74,13 @@ void SyncCycle::SendEventNotification(SyncCycleEvent::EventCause cause) {
   event.snapshot = TakeSnapshot();
 
   DVLOG(1) << "Sending event with snapshot: " << event.snapshot.ToString();
-  FOR_EACH_OBSERVER(SyncEngineEventListener, *(context_->listeners()),
-                    OnSyncCycleEvent(event));
+  for (auto& observer : *context_->listeners())
+    observer.OnSyncCycleEvent(event);
 }
 
 void SyncCycle::SendProtocolEvent(const ProtocolEvent& event) {
-  FOR_EACH_OBSERVER(SyncEngineEventListener, *(context_->listeners()),
-                    OnProtocolEvent(event));
+  for (auto& observer : *context_->listeners())
+    observer.OnProtocolEvent(event);
 }
 
 }  // namespace syncer